\[RightTriangle] (Mathematica Character Name)

Unicode: 22B3. Infix ordering operator. x ⊳ y is by default interpreted as RightTriangle[x,y]. Used in pure mathematics to mean 'contains as a normal subgroup'.

\[RightVector] (Mathematica Character Name)

Unicode: 21C0. Alias: Esc vec Esc. Infix and overfix arrow-like operator. x ⇀ y is by default interpreted as RightVector[x,y]. Used in mathematics to indicate weak ...

\[RuleDelayed] (Mathematica Character Name)

Unicode: F51F. Alias: Esc :> Esc. Infix operator with built-in evaluation rules. x  y is by default interpreted as x:>y or RuleDelayed[x,y]. x  y  z groups as x  (y  z).

\[Rule] (Mathematica Character Name)

Unicode: F522. Alias: Esc -> Esc. Infix operator with built-in evaluation rules. x  y is by default interpreted as x->y or Rule[x,y]. x  y  z groups as x  (y  z). ...

\[Sampi] (Mathematica Character Name)

Unicode: 03E0. Aliases: Esc sa Esc, Esc sampi Esc. Special Greek letter. Appeared after ω in early Greek alphabet; used for Greek numeral 900.

\[Sigma] (Mathematica Character Name)

Unicode: 03C3. Aliases: Esc s Esc, Esc sigma Esc. Greek letter. Used in TraditionalForm for DivisorSigma and WeierstrassSigma.

\[SmallCircle] (Mathematica Character Name)

Unicode: 2218. Alias: Esc sc Esc. Infix operator. x ∘ y is by default interpreted as SmallCircle[x,y]. Used to indicate function composition. Not the same as the letter-like ...

\[Square] (Mathematica Character Name)

Unicode: F520. Alias: Esc sq Esc. Prefix operator.  x is by default interpreted as Square[x]. Used in mathematical physics to denote the d'Alembertian operator. Sometimes ...

\[Sterling] (Mathematica Character Name)

Unicode: 00A3. Letter-like form. Currency symbol for British pound sterling, as in £ 5. Used in mathematics to denote Lie derivative.

\[Stigma] (Mathematica Character Name)

Unicode: 03DB. Aliases: Esc sti Esc, Esc stigma Esc. Special Greek letter. Appeared between ϵ and ζ in early Greek alphabet; used for Greek numeral 6. Not the same as ...